Chair having adjustable back.



No. 865,431. PATENTED SEPT. 10, 1907.

S RISLEY & P. B. RUGER CHAIR HAVING ADJUSTABLE BACK.

APPLICATION FILED JAN. 18. 1906.

/ N VE 70.96

A TTOHNE Y.

UNITED STATES PATENT OFFICE.

SENECA RISLEY AND FORREST E. RUGER, OF BINGHAMTON, NEW YORK.

CHAIR HAVING ADJUSTABLE BACK.

Specification of Letters Patent.

Patented Sept. 10, 1907.

Application filed January 18,1906. Serial No. 296,649.

To all whom it may concern.-

Be it known that we, SENECA RIsLnY and FORREST E. RUGER, both citizensof the United States, residing at Binghamton, in the county of Broomeand State of New York, have invented a new and useful Improvement inChairs Having Adjustable Backs, of which the following is aspecification.

Our invention relates to improvements in chairs hav ing adjustablebacks, in which the back is hinged or lulcrumed to the base of the chairand supported by a traverse rod extending behind the back and engaging arack in the arm of the chair or in a metallic plate attached thereto.

The objects of our invention are to provide a chair with a movable backwhich may be fixed in any desired position by means of a rotatable rodprovided with Cranks at its ends, which cranks engage and disengage rackplates by means of a movable cam plate actuated by a controlling rodbracketed to the arm of the chair. We attain these objects by themechanism illustrated in the accompanying drawing.

Figure 1 is a side view showing our improved mechanism for adjusting thebacks of chairs when attached to same. Fig. 2 is a rear view of saidchair, and Fig. 3 is an enlarged sectional side view, illustrating theprincipal parts of our invention Fig. 4 is a detail view of our camplate, by means of which we raise and lower simultaneously either end ofthe cranked supporting rod.

In the drawings, A represents the chair proper, the hinged back of whichis raised by the tension spring f the tendency of which spring is toalways carry the back toward an up-right position.

The rod a is cranked at either end and attached to the back by staples,as shown in Fig. 2, which staples form bearings, in which the rod arotates and which, by its extreme ends, forms dogs which engage theracks b b, as shown in Fig. 2, and firmly support the back in thedesired position.

The dog a, which is a continuation of the rod a is carried out of therack b by means of the controlling rod (1, which acts as a lever whenacted upon by pressure of the hand at d when the cam plate 0 is forcedupwardly, carrying the dog a out of the rack plates 11 b, when thehinged back may be pressed backwardly, or automatically carried forwardby the tension spring f to the desired position, into which position theback is locked by releasing the controlling rod (1, which is carriedforward by the coiled spring (1 thus acting upon the cam plate 0, whichcauses the dog a to descend and engage the rack b It will be noted thatthe cam plate c is positive in its action, the dog a being carrieddownward and held in the rack by the upper portion of the cam plate 0.

The slots 0 0 in the cam plate 0, engage the 7 guide posts g g and giveproper alinement and support to the cam plate, when being acted upon bythe controlling rod d. The controlling rod d being pivoted to the camplate 0, as shown in Figs. 1 and 3, passes through the eye of thebracket (1, between which and the knob d is interposed a coiled springWhen pressure by the hand is applied to the knob (i compressing thecoiled spring d the rod actuates the cam plate 0, causing it to moveupwardly upon the guide posts 9 g and raise the cupant oi the chair, bya proper movement of the body, Causes the back of the chair to move tothe desired position, when the dogs a a are made to descend and engagethe racks b b, by releasing the knob d b b represent iron dowel pins, bymeans of which the rack plates are attached to the chairv What we claimas new and desire to protect by Letters Patent is In a chair, a frame, amovable back connected thereto, a rotatable rod carried by the back, andprovided with cranks at its ends, rack plates carried by the chair frameand engaged by the said cranks, a movable cam plate carried by the rackplate and a controlling rod connected with the cam plate and bracketedto the frame of the chair for actuating the cam plate.

SENECA RISLEY. FORREST E. RUGER.

Witnesses G. H. WINnLnn, JAMES BInnsALL.

a from the racks b b, when the oc-

